Merge branch 'PHP-7.4'

Allow throwing exception while loading parent class

This is a fix for symfony/symfony#32995.

The behavior is:

* Throwing exception when loading parent/interface is allowed

Allow throwing exception while loading parent class

This is a fix for symfony/symfony#32995.

The behavior is:

* Throwing exception when loading parent/interface is allowed
(and we will also throw one if the class is simply not found).
* If this happens, the bucket key for the class is reset, so
it's possibly to try registering the same class again.
* However, if the class has already been used due to a variance
obligation, the exception is upgraded to a fatal error, as we
cannot safely unregister the class stub anymore.

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Merge branch 'PHP-7.4'

Only allow "nearly linked" classes for parent/interface

The requirements for parent/interface are difference than for the
variance checks in type declarations. The latter can work on ful

Only allow "nearly linked" classes for parent/interface

The requirements for parent/interface are difference than for the
variance checks in type declarations. The latter can work on fully
unlinked classes, but the former need inheritance to be essentially
finished, only variance checks may still be outstanding.

Adding a new flag for this because we have lots of space, but we
could also represent these "inheritance states" more compactly in
the future.

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Mention that arg_info[-1] holds the return info

I lost some time trying to know how to find the returned type.
It's not that obvious it is stored in the _argument_ information array.

Mention that arg_info[-1] holds the return info

I lost some time trying to know how to find the returned type.
It's not that obvious it is stored in the _argument_ information array.

For the sake of Internet, here is the full code checking that a function _has_ a returned type:

```c
zend_function *function = /* e.g. fci_cache->function_handler */;

if (!(function->op_array.fn_flags & ZEND_ACC_HAS_RETURN_TYPE)) {
php_printf("no return type\n");
} else {
php_printf("has a return type\n");
php_printf("return type = %s\n", zend_get_type_by_const(ZEND_TYPE_CODE(function->common.arg_info[-1].type)));
}
```

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Merge branch 'PHP-7.4'

* PHP-7.4:
Free two bits in fn_flags by merging ZEND_ACC_HEAP_RT_CACHE/ZEND_ACC_USER_ARG_INFO and ZEND_ACC_DONE_PASS_TWO/ZEND_ACC_ARENA_ALLOCATED that may be use

Merge branch 'PHP-7.4'

* PHP-7.4:
Free two bits in fn_flags by merging ZEND_ACC_HEAP_RT_CACHE/ZEND_ACC_USER_ARG_INFO and ZEND_ACC_DONE_PASS_TWO/ZEND_ACC_ARENA_ALLOCATED that may be used only for user/internal functions

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Free two bits in fn_flags by merging ZEND_ACC_HEAP_RT_CACHE/ZEND_ACC_USER_ARG_INFO and ZEND_ACC_DONE_PASS_TWO/ZEND_ACC_ARENA_ALLOCATED that may be used only for user/internal functions

Merge branch 'PHP-7.4'

* PHP-7.4:
Fixed information about unused flags

Fixed information about unused flags

Merge branch 'PHP-7.4'

Relax closure $this unbinding deprecation

Only deprecate unbinding of $this from a closure if $this is
syntactically used within the closure.

This is desired to support Laravel'

Relax closure $this unbinding deprecation

Only deprecate unbinding of $this from a closure if $this is
syntactically used within the closure.

This is desired to support Laravel's macro system, see laravel/framework#29482.

This should still allow us to implement the performance improvements
we're interested in for PHP 8, without breaking existing use-cases.

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Merge branch 'PHP-7.4'

* PHP-7.4:
Use run-time cache to avoid repeatable hash lookups in ZEND_DECLARE_CLASS_DELAYED

Use run-time cache to avoid repeatable hash lookups in ZEND_DECLARE_CLASS_DELAYED

Merge branch 'PHP-7.4'

Deprecate alternative array access syntax

RFC: https://wiki.php.net/rfc/deprecate_curly_braces_array_access

Merge branch 'PHP-7.4'

* PHP-7.4:
Replace ZEND_ASSIGN_ADD (and others) by ZEND_ASSIGN_OP, ZEND_ASSIGN_DIM_OP, ZEND_ASSGIN_OBJ_OP and ZEND_ASSIGN_STATIC_PROP_OP

Replace ZEND_ASSIGN_ADD (and others) by ZEND_ASSIGN_OP, ZEND_ASSIGN_DIM_OP, ZEND_ASSGIN_OBJ_OP and ZEND_ASSIGN_STATIC_PROP_OP

Merge branch 'PHP-7.4'

* PHP-7.4:
Optimization of INC/DEC helpers

Optimization of INC/DEC helpers

Merge branch 'PHP-7.4'

Fix arginfo leak in disable_functions

Arginfo is allocated if types are used, we need to free it.

Merge branch 'PHP-7.4'

* PHP-7.4:
Keep lowercased parent class name as second argument of DECLARE_CLASS to avoid extra work at run-time

Keep lowercased parent class name as second argument of DECLARE_CLASS to avoid extra work at run-time

Merge branch 'PHP-7.4'

Make ZEND_SEND_* flags unsigned

These may be shifted to the limit for the arg mask.